2022 International Conference on Solid State Devices and Materials

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Oral Presentation

05: Photonics: Devices / Integration / Related Technology

[A-6] III-V Light Sources

2022年9月28日(水) 13:30 〜 15:45 101 (1F)

Session Chair: Yuhki Itoh (Sumitomo Electric Industries, Ltd.), Nobuhiko Ozaki (Wakayama Univ.)

15:00 〜 15:15

[A-6-07] [No Show] Consideration of the interface diffusions for narrow-period terahertz quantum cascade lasers

〇Li WANG1, Tsung-Tse Lin1, Thomas Grange2, Ke Wang3, Hideki Hirayama1 (1. RIKEN (Japan), 2. nextnano (Germany), 3. nanjing Univ. (China))

Presentation style: Online

The effects of diffused interface scattering on the transport and the optical gain is still not well shown. In this work, we have determined the interface profiles of GaAs/Al0.3Ga0.7As quantum structures using transmis-sion electron microscopy (TEM). The diffused width is extracted following sigmdial-type functions and then used as basic parameters to estimate the scattering of such a diffused interface based on NEGF method. The optical gain of the 3-level terahertz quantum cascade lasers at 300K is 32% down when such a diffused interface is con-sidered. However, the corresponding scattering is not the reason as its strength is quite small that plays a minor role on the lifetime of states, instead, the shifting of wave-function is original for this change of gain by leading to an obvious misalignment of resonant tunneling for injec-tion.

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